append (v.)

late 14c., appenden, "to belong to as a possession or right," from Old French apendre (13c.) "belong, be dependent (on); attach (oneself) to; hang, hang up," and directly from Latin appendere "cause to hang (from something); weigh out," from ad "to" (see ad-) + pendere "to hang, cause to hang; weight; pay" (from PIE root *(s)pen- "to draw, stretch, spin").

The meaning "to hang on, attach as a pendant" is by 1640s; that of "attach as an appendix" is recorded by 1843. OED says the original word was obsolete by c. 1500, and these later transitive senses thus represent a reborrowing from Latin or French. Related: Appended; appending.